This is a high-performance replacement cellular battery for the Samsung GALAXY S 2 SGH-I777, guaranteed to meet or exceed the OEM specifications of your original. The cellular battery is 2.32 x 1.8 x 0.211 inches with an output of 3.7 volts. The chemistry is LI-ION at 1200mAH capacity. Manufactured by Empire Scientific, model number BLI-1257-1.2. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.